[FFmpeg-devel] [PATCH v19 12/20] avfilter/overlaygraphicsubs: Add overlaygraphicsubs and graphicsub2video filters
Soft Works
softworkz at hotmail.com
Fri Dec 3 21:31:26 EET 2021
- overlaygraphicsubs (VS -> V)
Overlay graphic subtitles onto a video stream
- graphicsub2video {S -> V)
Converts graphic subtitles to video frames (with alpha)
Gets auto-inserted for retaining compatibility with
sub2video command lines
Signed-off-by: softworkz <softworkz at hotmail.com>
---
doc/filters.texi | 118 +++++
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 2 +
libavfilter/vf_overlaygraphicsubs.c | 737 ++++++++++++++++++++++++++++
4 files changed, 859 insertions(+)
create mode 100644 libavfilter/vf_overlaygraphicsubs.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 3edf3f50b0..669b9f5365 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -25635,6 +25635,124 @@ tools.
@c man end VIDEO SINKS
+ at chapter Subtitle Filters
+ at c man begin SUBTITLE FILTERS
+
+When you configure your FFmpeg build, you can disable any of the
+existing filters using @code{--disable-filters}.
+
+Below is a description of the currently available subtitle filters.
+
+ at section graphicsub2video
+
+Renders graphic subtitles as video frames.
+
+This filter replaces the previous "sub2video" hack which did the conversion implicitly and up-front as subtitle filtering wasn't possible at that time.
+To retain compatibility with earlier sub2video command lines, this filter is being auto-inserted in those cases.
+
+For overlaying graphicsal subtitles it is recommended to use the 'overlay_graphicsubs' filter which is more efficient and takes less processing resources.
+
+This filter is still useful in cases where the overlay is done with hardware acceleration (e.g. overlay_qsv, overlay_vaapi, overlay_cuda) for preparing the overlay frames.
+
+Inputs:
+ at itemize
+ at item 0: Subtitles [BITMAP]
+ at end itemize
+
+Outputs:
+ at itemize
+ at item 0: Video [RGB32]
+ at end itemize
+
+
+It accepts the following parameters:
+
+ at table @option
+ at item size, s
+Set the size of the output video frame.
+
+ at end table
+
+ at subsection Examples
+
+ at itemize
+ at item
+Overlay PGS subtitles
+(not recommended - better use overlay_graphicsubs)
+ at example
+ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:1]graphicsub2video[subs];[0:0][subs]overlay" output.mp4
+ at end example
+
+ at item
+Overlay PGS subtitles implicitly
+The graphicsub2video is inserted automatically for compatibility with legacy command lines.
+ at example
+ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:0][0:1]overlay" output.mp4
+ at end example
+ at end itemize
+
+ at section overlaygraphicsubs
+
+Overlay graphic subtitles onto a video stream.
+
+This filter can blend graphical subtitles on a video stream directly, i.e. without creating full-size alpha images first.
+The blending operation is limited to the area of the subtitle rectangles, which also means that no processing is done at times where no subtitles are to be displayed.
+
+Inputs:
+ at itemize
+ at item 0: Video [YUV420P, YUV422P, YUV444P, ARGB, RGBA, ABGR, BGRA, RGB24, BGR24]
+ at item 1: Subtitles [BITMAP]
+ at end itemize
+
+Outputs:
+ at itemize
+ at item 0: Video (same as input)
+ at end itemize
+
+It accepts the following parameters:
+
+ at table @option
+ at item x
+ at item y
+Set the expression for the x and y coordinates of the overlaid video
+on the main video. Default value is "0" for both expressions. In case
+the expression is invalid, it is set to a huge value (meaning that the
+overlay will not be displayed within the output visible area).
+
+ at item eof_action
+See @ref{framesync}.
+
+ at item eval
+Set when the expressions for @option{x}, and @option{y} are evaluated.
+
+It accepts the following values:
+ at table @samp
+ at item init
+only evaluate expressions once during the filter initialization or
+when a command is processed
+
+ at item frame
+evaluate expressions for each incoming frame
+ at end table
+
+Default value is @samp{frame}.
+
+ at item shortest
+See @ref{framesync}.
+
+ at end table
+
+ at subsection Examples
+
+ at itemize
+ at item
+Overlay PGS subtitles
+ at example
+ffmpeg -i "https://streams.videolan.org/samples/sub/PGS/Girl_With_The_Dragon_Tattoo_2%3A23%3A56.mkv" -filter_complex "[0:0][0:1]overlaygraphicsubs" output.mp4
+ at end example
+ at end itemize
+ at c man end SUBTITLE FILTERS
+
@chapter Multimedia Filters
@c man begin MULTIMEDIA FILTERS
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 664566a18a..525b3a6e3c 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -295,6 +295,7 @@ OBJS-$(CONFIG_GBLUR_FILTER) += vf_gblur.o
OBJS-$(CONFIG_GBLUR_VULKAN_FILTER) += vf_gblur_vulkan.o vulkan.o vulkan_filter.o
OBJS-$(CONFIG_GEQ_FILTER) += vf_geq.o
OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
+OBJS-$(CONFIG_GRAPHICSUB2VIDEO_FILTER) += vf_overlaygraphicsubs.o framesync.o
OBJS-$(CONFIG_GRAPHMONITOR_FILTER) += f_graphmonitor.o
OBJS-$(CONFIG_GRAYWORLD_FILTER) += vf_grayworld.o
OBJS-$(CONFIG_GREYEDGE_FILTER) += vf_colorconstancy.o
@@ -375,6 +376,7 @@ OBJS-$(CONFIG_OVERLAY_OPENCL_FILTER) += vf_overlay_opencl.o opencl.o \
opencl/overlay.o framesync.o
OBJS-$(CONFIG_OVERLAY_QSV_FILTER) += vf_overlay_qsv.o framesync.o
OBJS-$(CONFIG_OVERLAY_VULKAN_FILTER) += vf_overlay_vulkan.o vulkan.o vulkan_filter.o
+OBJS-$(CONFIG_OVERLAYGRAPHICSUBS_FILTER) += vf_overlaygraphicsubs.o framesync.o
OBJS-$(CONFIG_OWDENOISE_FILTER) += vf_owdenoise.o
OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
OBJS-$(CONFIG_PAD_OPENCL_FILTER) += vf_pad_opencl.o opencl.o opencl/pad.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index dbcc180fd9..c99e1b8484 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -357,6 +357,7 @@ extern const AVFilter ff_vf_oscilloscope;
extern const AVFilter ff_vf_overlay;
extern const AVFilter ff_vf_overlay_opencl;
extern const AVFilter ff_vf_overlay_qsv;
+extern const AVFilter ff_vf_overlaygraphicsubs;
extern const AVFilter ff_vf_overlay_vulkan;
extern const AVFilter ff_vf_overlay_cuda;
extern const AVFilter ff_vf_owdenoise;
@@ -542,6 +543,7 @@ extern const AVFilter ff_avf_showvolume;
extern const AVFilter ff_avf_showwaves;
extern const AVFilter ff_avf_showwavespic;
extern const AVFilter ff_vaf_spectrumsynth;
+extern const AVFilter ff_svf_graphicsub2video;
/* multimedia sources */
extern const AVFilter ff_avsrc_amovie;
diff --git a/libavfilter/vf_overlaygraphicsubs.c b/libavfilter/vf_overlaygraphicsubs.c
new file mode 100644
index 0000000000..37153baaf5
--- /dev/null
+++ b/libavfilter/vf_overlaygraphicsubs.c
@@ -0,0 +1,737 @@
+/*
+ * Copyright (c) 2021 softworkz (derived from vf_overlay)
+ * Copyright (c) 2010 Stefano Sabatini
+ * Copyright (c) 2010 Baptiste Coudurier
+ * Copyright (c) 2007 Bobby Bingham
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * overlay graphical subtitles on top of a video frame
+ */
+
+#include "libavutil/eval.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "internal.h"
+#include "drawutils.h"
+#include "framesync.h"
+
+enum var_name {
+ VAR_MAIN_W, VAR_MW,
+ VAR_MAIN_H, VAR_MH,
+ VAR_OVERLAY_W, VAR_OW,
+ VAR_OVERLAY_H, VAR_OH,
+ VAR_HSUB,
+ VAR_VSUB,
+ VAR_X,
+ VAR_Y,
+ VAR_N,
+ VAR_POS,
+ VAR_T,
+ VAR_VARS_NB
+};
+
+typedef struct OverlaySubsContext {
+ const AVClass *class;
+ int x, y; ///< position of overlaid picture
+ int w, h;
+ AVFrame *outpicref;
+
+ int main_is_packed_rgb;
+ uint8_t main_rgba_map[4];
+ int main_has_alpha;
+ uint8_t overlay_rgba_map[4];
+ int eval_mode; ///< EvalMode
+
+ FFFrameSync fs;
+
+ int main_pix_step[4]; ///< steps per pixel for each plane of the main output
+ int hsub, vsub; ///< chroma subsampling values
+ const AVPixFmtDescriptor *main_desc; ///< format descriptor for main input
+
+ double var_values[VAR_VARS_NB];
+ char *x_expr, *y_expr;
+
+ AVExpr *x_pexpr, *y_pexpr;
+
+ int pic_counter;
+} OverlaySubsContext;
+
+static const char *const var_names[] = {
+ "main_w", "W", ///< width of the main video
+ "main_h", "H", ///< height of the main video
+ "overlay_w", "w", ///< width of the overlay video
+ "overlay_h", "h", ///< height of the overlay video
+ "hsub",
+ "vsub",
+ "x",
+ "y",
+ "n", ///< number of frame
+ "pos", ///< position in the file
+ "t", ///< timestamp expressed in seconds
+ NULL
+};
+
+#define MAIN 0
+#define OVERLAY 1
+
+#define R 0
+#define G 1
+#define B 2
+#define A 3
+
+#define Y 0
+#define U 1
+#define V 2
+
+enum EvalMode {
+ EVAL_MODE_INIT,
+ EVAL_MODE_FRAME,
+ EVAL_MODE_NB
+};
+
+static av_cold void overlay_graphicsubs_uninit(AVFilterContext *ctx)
+{
+ OverlaySubsContext *s = ctx->priv;
+
+ ff_framesync_uninit(&s->fs);
+ av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
+ av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
+}
+
+static inline int normalize_xy(double d, int chroma_sub)
+{
+ if (isnan(d))
+ return INT_MAX;
+ return (int)d & ~((1 << chroma_sub) - 1);
+}
+
+static void eval_expr(AVFilterContext *ctx)
+{
+ OverlaySubsContext *s = ctx->priv;
+
+ s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
+ s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
+ /* It is necessary if x is expressed from y */
+ s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
+ s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
+ s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
+}
+
+static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
+{
+ int ret;
+ AVExpr *old = NULL;
+
+ if (*pexpr)
+ old = *pexpr;
+ ret = av_expr_parse(pexpr, expr, var_names,
+ NULL, NULL, NULL, NULL, 0, log_ctx);
+ if (ret < 0) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Error when evaluating the expression '%s' for %s\n",
+ expr, option);
+ *pexpr = old;
+ return ret;
+ }
+
+ av_expr_free(old);
+ return 0;
+}
+
+static int overlay_graphicsubs_query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *formats;
+ AVFilterLink *inlink0 = ctx->inputs[0];
+ AVFilterLink *inlink1 = ctx->inputs[1];
+ AVFilterLink *outlink = ctx->outputs[0];
+ int ret;
+ static const enum AVSubtitleType subtitle_fmts[] = { AV_SUBTITLE_FMT_BITMAP, AV_SUBTITLE_FMT_NONE };
+ static const enum AVPixelFormat supported_pix_fmts[] = {
+ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
+ AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
+ AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
+ AV_PIX_FMT_NONE
+ };
+
+ /* set input0 video formats */
+ formats = ff_make_format_list(supported_pix_fmts);
+ if ((ret = ff_formats_ref(formats, &inlink0->outcfg.formats)) < 0)
+ return ret;
+
+ /* set output0 video formats */
+ if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
+ return ret;
+
+ /* set input1 subtitle formats */
+ formats = ff_make_format_list(subtitle_fmts);
+ if ((ret = ff_formats_ref(formats, &inlink1->outcfg.formats)) < 0)
+ return ret;
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ OverlaySubsContext *s = ctx->priv;
+ int ret;
+
+ if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
+ return ret;
+
+ outlink->w = ctx->inputs[MAIN]->w;
+ outlink->h = ctx->inputs[MAIN]->h;
+ outlink->time_base = ctx->inputs[MAIN]->time_base;
+
+ return ff_framesync_configure(&s->fs);
+}
+
+// divide by 255 and round to nearest
+// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
+#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
+
+// calculate the non-pre-multiplied alpha, applying the general equation:
+// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
+// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
+// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
+#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
+
+/**
+ * Blend image in src to destination buffer dst at position (x, y).
+ */
+static av_always_inline void blend_packed_rgb(const AVFilterContext *ctx,
+ const AVFrame *dst, const AVSubtitleArea *src,
+ int x, int y,
+ int is_straight)
+{
+ OverlaySubsContext *s = ctx->priv;
+ int i, imax, j, jmax;
+ const int src_w = src->w;
+ const int src_h = src->h;
+ const int dst_w = dst->width;
+ const int dst_h = dst->height;
+ uint8_t alpha; ///< the amount of overlay to blend on to main
+ const int dr = s->main_rgba_map[R];
+ const int dg = s->main_rgba_map[G];
+ const int db = s->main_rgba_map[B];
+ const int da = s->main_rgba_map[A];
+ const int dstep = s->main_pix_step[0];
+ const int sr = s->overlay_rgba_map[R];
+ const int sg = s->overlay_rgba_map[G];
+ const int sb = s->overlay_rgba_map[B];
+ const int sa = s->overlay_rgba_map[A];
+ int slice_start, slice_end;
+ uint8_t *S, *sp, *d, *dp;
+
+ i = FFMAX(-y, 0);
+ imax = FFMIN3(-y + dst_h, FFMIN(src_h, dst_h), y + src_h);
+
+ slice_start = i;
+ slice_end = i + imax;
+
+ sp = src->buf[0]->data + slice_start * src->linesize[0];
+ dp = dst->data[0] + (slice_start + y) * dst->linesize[0];
+
+ for (i = slice_start; i < slice_end; i++) {
+ j = FFMAX(-x, 0);
+ S = sp + j;
+ d = dp + ((x + j) * dstep);
+
+ for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
+ uint32_t val = src->pal[*S];
+ const uint8_t *sval = (uint8_t *)&val;
+ alpha = sval[sa];
+
+ // if the main channel has an alpha channel, alpha has to be calculated
+ // to create an un-premultiplied (straight) alpha value
+ if (s->main_has_alpha && alpha != 0 && alpha != 255) {
+ const uint8_t alpha_d = d[da];
+ alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
+ }
+
+ switch (alpha) {
+ case 0:
+ break;
+ case 255:
+ d[dr] = sval[sr];
+ d[dg] = sval[sg];
+ d[db] = sval[sb];
+ break;
+ default:
+ // main_value = main_value * (1 - alpha) + overlay_value * alpha
+ // since alpha is in the range 0-255, the result must divided by 255
+ d[dr] = is_straight ? FAST_DIV255(d[dr] * (255 - alpha) + sval[sr] * alpha) :
+ FFMIN(FAST_DIV255(d[dr] * (255 - alpha)) + sval[sr], 255);
+ d[dg] = is_straight ? FAST_DIV255(d[dg] * (255 - alpha) + sval[sg] * alpha) :
+ FFMIN(FAST_DIV255(d[dg] * (255 - alpha)) + sval[sg], 255);
+ d[db] = is_straight ? FAST_DIV255(d[db] * (255 - alpha) + sval[sb] * alpha) :
+ FFMIN(FAST_DIV255(d[db] * (255 - alpha)) + sval[sb], 255);
+ }
+
+ if (s->main_has_alpha) {
+ switch (alpha) {
+ case 0:
+ break;
+ case 255:
+ d[da] = sval[sa];
+ break;
+ default:
+ // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
+ d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
+ }
+ }
+ d += dstep;
+ S += 1;
+ }
+ dp += dst->linesize[0];
+ sp += src->linesize[0];
+ }
+}
+
+static av_always_inline void blend_plane_8_8bits(const AVFilterContext *ctx, const AVFrame *dst, const AVSubtitleArea *area,
+ const uint32_t *yuv_pal, int src_w, int src_h, int dst_w, int dst_h, int plane, int hsub, int vsub,
+ int x, int y, int dst_plane, int dst_offset, int dst_step)
+{
+ const int src_wp = AV_CEIL_RSHIFT(src_w, hsub);
+ const int src_hp = AV_CEIL_RSHIFT(src_h, vsub);
+ const int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub);
+ const int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub);
+ const int yp = y >> vsub;
+ const int xp = x >> hsub;
+ uint8_t *s, *sp, *d, *dp, *dap;
+ int imax, i, j, jmax;
+ int slice_start, slice_end;
+
+ i = FFMAX(-yp, 0); \
+ imax = FFMIN3(-yp + dst_hp, FFMIN(src_hp, dst_hp), yp + src_hp); \
+
+ slice_start = i;
+ slice_end = i + imax;
+
+ sp = area->buf[0]->data + (slice_start << vsub) * area->linesize[0];
+ dp = dst->data[dst_plane] + (yp + slice_start) * dst->linesize[dst_plane] + dst_offset;
+
+ dap = dst->data[3] + ((yp + slice_start) << vsub) * dst->linesize[3];
+
+ for (i = slice_start; i < slice_end; i++) {
+ j = FFMAX(-xp, 0);
+ d = dp + (xp + j) * dst_step;
+ s = sp + (j << hsub);
+ jmax = FFMIN(-xp + dst_wp, src_wp);
+
+ for (; j < jmax; j++) {
+ uint32_t val = yuv_pal[*s];
+ const uint8_t *sval = (uint8_t *)&val;
+ const int alpha = sval[3];
+ const int max = 255, mid = 128;
+ const int d_int = *d;
+ const int sval_int = sval[plane];
+
+ switch (alpha) {
+ case 0:
+ break;
+ case 255:
+ *d = sval[plane];
+ break;
+ default:
+ if (plane > 0)
+ *d = av_clip(FAST_DIV255((d_int - mid) * (max - alpha) + (sval_int - mid) * alpha) , -mid, mid) + mid;
+ else
+ *d = FAST_DIV255(d_int * (max - alpha) + sval_int * alpha);
+ break;
+ }
+
+ d += dst_step;
+ s += 1 << hsub;
+ }
+ dp += dst->linesize[dst_plane];
+ sp += (1 << vsub) * area->linesize[0];
+ dap += (1 << vsub) * dst->linesize[3];
+ }
+}
+
+#define RGB2Y(r, g, b) (uint8_t)(((66 * (r) + 129 * (g) + 25 * (b) + 128) >> 8) + 16)
+#define RGB2U(r, g, b) (uint8_t)(((-38 * (r) - 74 * (g) + 112 * (b) + 128) >> 8) + 128)
+#define RGB2V(r, g, b) (uint8_t)(((112 * (r) - 94 * (g) - 18 * (b) + 128) >> 8) + 128)
+/* Converts R8 G8 B8 color to YUV. */
+static av_always_inline void rgb_2_yuv(uint8_t r, uint8_t g, uint8_t b, uint8_t* y, uint8_t* u, uint8_t* v)
+{
+ *y = RGB2Y((int)r, (int)g, (int)b);
+ *u = RGB2U((int)r, (int)g, (int)b);
+ *v = RGB2V((int)r, (int)g, (int)b);
+}
+
+
+static av_always_inline void blend_yuv_8_8bits(AVFilterContext *ctx, AVFrame *dst, const AVSubtitleArea *area, int hsub, int vsub, int x, int y)
+{
+ OverlaySubsContext *s = ctx->priv;
+ const int src_w = area->w;
+ const int src_h = area->h;
+ const int dst_w = dst->width;
+ const int dst_h = dst->height;
+ const int sr = s->overlay_rgba_map[R];
+ const int sg = s->overlay_rgba_map[G];
+ const int sb = s->overlay_rgba_map[B];
+ const int sa = s->overlay_rgba_map[A];
+ uint32_t yuvpal[256];
+
+ for (int i = 0; i < 256; ++i) {
+ const uint8_t *rgba = (const uint8_t *)&area->pal[i];
+ uint8_t *yuva = (uint8_t *)&yuvpal[i];
+ rgb_2_yuv(rgba[sr], rgba[sg], rgba[sb], &yuva[Y], &yuva[U], &yuva[V]);
+ yuva[3] = rgba[sa];
+ }
+
+ blend_plane_8_8bits(ctx, dst, area, yuvpal, src_w, src_h, dst_w, dst_h, Y, 0, 0, x, y, s->main_desc->comp[Y].plane, s->main_desc->comp[Y].offset, s->main_desc->comp[Y].step);
+ blend_plane_8_8bits(ctx, dst, area, yuvpal, src_w, src_h, dst_w, dst_h, U, hsub, vsub, x, y, s->main_desc->comp[U].plane, s->main_desc->comp[U].offset, s->main_desc->comp[U].step);
+ blend_plane_8_8bits(ctx, dst, area, yuvpal, src_w, src_h, dst_w, dst_h, V, hsub, vsub, x, y, s->main_desc->comp[V].plane, s->main_desc->comp[V].offset, s->main_desc->comp[V].step);
+}
+
+static int config_input_main(AVFilterLink *inlink)
+{
+ int ret;
+ AVFilterContext *ctx = inlink->dst;
+ OverlaySubsContext *s = inlink->dst->priv;
+ const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
+
+ av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
+ ff_fill_rgba_map(s->overlay_rgba_map, AV_PIX_FMT_RGB32); // it's actually AV_PIX_FMT_PAL8);
+
+ s->hsub = pix_desc->log2_chroma_w;
+ s->vsub = pix_desc->log2_chroma_h;
+
+ s->main_desc = pix_desc;
+
+ s->main_is_packed_rgb = ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
+ s->main_has_alpha = !!(pix_desc->flags & AV_PIX_FMT_FLAG_ALPHA);
+
+ /* Finish the configuration by evaluating the expressions
+ now when both inputs are configured. */
+ s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
+ s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
+ s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
+ s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
+ s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
+ s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
+ s->var_values[VAR_X] = NAN;
+ s->var_values[VAR_Y] = NAN;
+ s->var_values[VAR_N] = 0;
+ s->var_values[VAR_T] = NAN;
+ s->var_values[VAR_POS] = NAN;
+
+ if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
+ (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
+ return ret;
+
+ if (s->eval_mode == EVAL_MODE_INIT) {
+ eval_expr(ctx);
+ av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
+ s->var_values[VAR_X], s->x,
+ s->var_values[VAR_Y], s->y);
+ }
+
+ av_log(ctx, AV_LOG_VERBOSE,
+ "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",
+ ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
+ av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
+ ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
+ av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
+ return 0;
+}
+
+static int do_blend(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ AVFrame *mainpic, *second;
+ OverlaySubsContext *s = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+ unsigned i;
+ int ret;
+
+ ret = ff_framesync_dualinput_get_writable(fs, &mainpic, &second);
+ if (ret < 0)
+ return ret;
+ if (!second)
+ return ff_filter_frame(ctx->outputs[0], mainpic);
+
+ if (s->eval_mode == EVAL_MODE_FRAME) {
+ int64_t pos = mainpic->pkt_pos;
+
+ s->var_values[VAR_N] = (double)inlink->frame_count_out;
+ s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
+ NAN :(double)mainpic->pts * av_q2d(inlink->time_base);
+ s->var_values[VAR_POS] = pos == -1 ? NAN : (double)pos;
+
+ s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
+ s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
+ s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
+ s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
+
+ eval_expr(ctx);
+ av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
+ s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
+ s->var_values[VAR_X], s->x,
+ s->var_values[VAR_Y], s->y);
+ }
+
+ for (i = 0; i < second->num_subtitle_areas; i++) {
+ const AVSubtitleArea *sub_area = second->subtitle_areas[i];
+
+ if (sub_area->type != AV_SUBTITLE_FMT_BITMAP) {
+ av_log(NULL, AV_LOG_WARNING, "overlay_graphicsub: non-bitmap subtitle\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch (inlink->format) {
+ case AV_PIX_FMT_YUV420P:
+ blend_yuv_8_8bits(ctx, mainpic, sub_area, 1, 1, sub_area->x + s->x, sub_area->y + s->y);
+ break;
+ case AV_PIX_FMT_YUV422P:
+ blend_yuv_8_8bits(ctx, mainpic, sub_area, 1, 0, sub_area->x + s->x, sub_area->y + s->y);
+ break;
+ case AV_PIX_FMT_YUV444P:
+ blend_yuv_8_8bits(ctx, mainpic, sub_area, 0, 0, sub_area->x + s->x, sub_area->y + s->y);
+ break;
+ case AV_PIX_FMT_RGB24:
+ case AV_PIX_FMT_BGR24:
+ case AV_PIX_FMT_ARGB:
+ case AV_PIX_FMT_RGBA:
+ case AV_PIX_FMT_BGRA:
+ case AV_PIX_FMT_ABGR:
+ blend_packed_rgb(ctx, mainpic, sub_area, sub_area->x + s->x, sub_area->y + s->y, 1);
+ break;
+ default:
+ av_log(NULL, AV_LOG_ERROR, "Unsupported input pix fmt: %d\n", inlink->format);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ return ff_filter_frame(ctx->outputs[0], mainpic);
+}
+
+static av_cold int overlay_graphicsubs_init(AVFilterContext *ctx)
+{
+ OverlaySubsContext *s = ctx->priv;
+
+ s->fs.on_event = do_blend;
+ return 0;
+}
+
+static int overlay_graphicsubs_activate(AVFilterContext *ctx)
+{
+ OverlaySubsContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+static int graphicsub2video_query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *formats;
+ AVFilterLink *inlink = ctx->inputs[0];
+ AVFilterLink *outlink = ctx->outputs[0];
+ static const enum AVSubtitleType subtitle_fmts[] = { AV_SUBTITLE_FMT_BITMAP, AV_SUBTITLE_FMT_NONE };
+ static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
+ int ret;
+
+ /* set input subtitle formats */
+ formats = ff_make_format_list(subtitle_fmts);
+ if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0)
+ return ret;
+
+ /* set output video formats */
+ formats = ff_make_format_list(pix_fmts);
+ if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
+ return ret;
+
+ return 0;
+}
+
+static int graphicsub2video_config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ OverlaySubsContext *s = ctx->priv;
+
+ if (s->w <= 0 || s->h <= 0) {
+ s->w = inlink->w;
+ s->h = inlink->h;
+ }
+ return 0;
+}
+
+static int graphicsub2video_config_output(AVFilterLink *outlink)
+{
+ const AVFilterContext *ctx = outlink->src;
+ OverlaySubsContext *s = ctx->priv;
+ const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(outlink->format);
+
+ outlink->w = s->w;
+ outlink->h = s->h;
+ outlink->sample_aspect_ratio = (AVRational){1,1};
+ outlink->time_base = ctx->inputs[0]->time_base;
+
+ av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
+ ff_fill_rgba_map(s->overlay_rgba_map, AV_PIX_FMT_RGB32);
+
+ s->hsub = pix_desc->log2_chroma_w;
+ s->vsub = pix_desc->log2_chroma_h;
+
+ s->main_desc = pix_desc;
+
+ s->main_is_packed_rgb = ff_fill_rgba_map(s->main_rgba_map, outlink->format) >= 0;
+ s->main_has_alpha = !!(pix_desc->flags & AV_PIX_FMT_FLAG_ALPHA);
+
+ return 0;
+}
+
+static int graphicsub2video_filter_frame(AVFilterLink *inlink, AVFrame *src_frame)
+{
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ const AVFilterContext *ctx = outlink->src;
+ OverlaySubsContext *s = ctx->priv;
+ AVFrame *out;
+ const unsigned num_rects = src_frame->num_subtitle_areas;
+ unsigned int i;
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&src_frame);
+ return AVERROR(ENOMEM);
+ }
+
+ // Maybe we should set these..
+ ////out->color_primaries = AVCOL_PRI_BT709;
+ ////out->color_range = AVCOL_RANGE_MPEG;
+ ////out->color_trc = AVCOL_TRC_BT709;
+
+ memset(out->data[0], 0, (size_t)out->linesize[0] * out->height);
+
+ out->pts = out->pkt_dts = out->best_effort_timestamp = src_frame->pts;
+ out->coded_picture_number = out->display_picture_number = s->pic_counter++;
+
+ for (i = 0; i < num_rects; i++) {
+ const AVSubtitleArea *sub_rect = src_frame->subtitle_areas[i];
+
+ if (sub_rect->type != AV_SUBTITLE_FMT_BITMAP) {
+ av_log(NULL, AV_LOG_WARNING, "sub2video: non-bitmap subtitle\n");
+ av_frame_free(&src_frame);
+ return AVERROR_INVALIDDATA;
+ }
+
+ blend_packed_rgb(inlink->dst, out, sub_rect, sub_rect->x, sub_rect->y, 1);
+ }
+
+ av_log(inlink->dst, AV_LOG_DEBUG, "graphicsub2video output - size %dx%d pts: %"PRId64" areas: %d\n", out->width, out->height, out->pts, src_frame->num_subtitle_areas);
+
+ av_frame_free(&src_frame);
+ return ff_filter_frame(outlink, out);
+}
+
+#define OFFSET(x) offsetof(OverlaySubsContext, x)
+#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
+
+static const AVOption overlaygraphicsubs_options[] = {
+ { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, .flags = FLAGS },
+ { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, .flags = FLAGS },
+ { "eof_action", "Action to take when encountering EOF from secondary input ",
+ OFFSET(fs.opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
+ EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
+ { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
+ { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
+ { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
+ { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
+ { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
+ { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
+ { "shortest", "force termination when the shortest input terminates", OFFSET(fs.opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = FLAGS },
+ { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(fs.opt_repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, .flags = FLAGS },
+ { NULL }
+};
+
+static const AVOption graphicsub2video_options[] = {
+ { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, .flags = FLAGS },
+ { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, .flags = FLAGS },
+ { NULL }
+};
+
+FRAMESYNC_DEFINE_CLASS(overlaygraphicsubs, OverlaySubsContext, fs);
+
+static const AVFilterPad overlaygraphicsubs_inputs[] = {
+ {
+ .name = "main",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input_main,
+ .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
+ },
+ {
+ .name = "overlay",
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ },
+};
+
+static const AVFilterPad overlaygraphicsubs_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+};
+
+const AVFilter ff_vf_overlaygraphicsubs = {
+ .name = "overlaygraphicsubs",
+ .description = NULL_IF_CONFIG_SMALL("Overlay graphical subtitles on top of the input."),
+ .preinit = overlaygraphicsubs_framesync_preinit,
+ .init = overlay_graphicsubs_init,
+ .uninit = overlay_graphicsubs_uninit,
+ .priv_size = sizeof(OverlaySubsContext),
+ .priv_class = &overlaygraphicsubs_class,
+ .activate = overlay_graphicsubs_activate,
+ FILTER_INPUTS(overlaygraphicsubs_inputs),
+ FILTER_OUTPUTS(overlaygraphicsubs_outputs),
+ FILTER_QUERY_FUNC(overlay_graphicsubs_query_formats),
+};
+
+AVFILTER_DEFINE_CLASS(graphicsub2video);
+
+static const AVFilterPad graphicsub2video_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .filter_frame = graphicsub2video_filter_frame,
+ .config_props = graphicsub2video_config_input,
+ },
+};
+
+static const AVFilterPad graphicsub2video_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = graphicsub2video_config_output,
+ },
+};
+
+const AVFilter ff_svf_graphicsub2video = {
+ .name = "graphicsub2video",
+ .description = NULL_IF_CONFIG_SMALL("Convert graphical subtitles to video"),
+ .priv_size = sizeof(OverlaySubsContext),
+ .priv_class = &graphicsub2video_class,
+ FILTER_INPUTS(graphicsub2video_inputs),
+ FILTER_OUTPUTS(graphicsub2video_outputs),
+ FILTER_QUERY_FUNC(graphicsub2video_query_formats),
+};
--
2.30.2.windows.1
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